The Tennessee Valley Authority (TVA) operates nearly 34,000 megawatts of electricity generating capacity–the most capacity among government-owned electricity providers in the United States. Balancing authorities like the TVA are responsible for balancing supply and demand for a specific portion of the power system. Sixty-six balancing authorities operate their own portion of the U.S. grid. The TVA covers most of Tennessee and provides over 90% of the state’s electricity. It also covers parts of Alabama, Mississippi, Kentucky, North Carolina, and Virginia.